Street trees really need watering weekly during the summer months for their first 3 years to get them properly established. The rate of watering needs to increase if it is a particularly dry summer. We recommend at least 20 litres per week. Trees like a really good soaking. It’s very difficult to over water your tree, but it’s very easy to under-water it.
Watering your tree is a great opportunity to bump into your neighbours, and makes a powerful statement that yours is a neighbourhood where people care. You may even wish to recruit some neighbours to help you.
Some councils may also provide their own watering to complement your watering effort.